PHP根目录的绝对路径 [英] PHP absolute path to root

问题描述

我不敢相信PHP对此简单问题没有简单的解决方案. ASP.NET带有〜符号，可解决此问题，并从根级别开始执行所有操作.这是我的问题:

I can't believe PHP doesn't have an easy solution of this simple matter. ASP.NET has a ~ sign that cares of this issue and starts everything from root level. Here's my problem:

localhost/MySite
   -->Admin
      -- Edit.php
   -->Class
      -- class.EditInfo.php
   -->Texts
      -- MyInfo.txt
   --ShowInfo.php

内部class.EditInfo.php我正在访问MyInfo.txt，所以我定义了一个相对路径"../Texts/MyInfo.txt".然后，我在Admin/Edit.php中创建了一个EditInfo对象，并访问了Texts/MyInfo.txt，它工作正常.

Inside class.EditInfo.php I am accessing MyInfo.txt so I defined a relative path "../Texts/MyInfo.txt". Then I created an object of EditInfo in Admin/Edit.php and accessed Texts/MyInfo.txt it worked fine.

但是现在我必须在ShowInfo.php中创建一个EditInfo对象并访问Texts/MyInfo.txt，这就是问题所在.每当我创建objEditInfo并尝试访问MyInfo.txt时都在类中使用相对路径时，出现文件不存在"错误.

But now I have to create an object of EditInfo in ShowInfo.php and access Texts/MyInfo.txt and here's the problem occurs. As I am using a relative path in my class whenever I am creating an objEditInfo and trying to access MyInfo.txt I am getting "File doesn't exist" error.

现在，我正在寻找与ASP.NET的〜/Texts/MyInfo.txt"等效的东西.有什么类似的东西吗???还是我必须设置一些if/else条件的路径?

Now I am looking for something that's equivalent to "~/Texts/MyInfo.txt" of ASP.NET. Is there anything similar to that out there??? Or do I have to set the path with some if/else condition?

更新:

我使用了$ _SERVER ['DOCUMENT_ROOT'].我使用的是我的实际网站所在的子文件夹.因此，我不得不使用$ _SERVER ['DOCUMENT_ROOT']."/mySite"&然后在其中添加其余地址("/Texts/MyInfo.php").

I used $_SERVER['DOCUMENT_ROOT']. I was using a subfolder where my actual website was. So I had to use $_SERVER['DOCUMENT_ROOT']."/mySite" & then adding rest of the address ("/Texts/MyInfo.php") to it.

推荐答案

使用ShowInfo.php中的define创建具有到根绝对路径的常量:

Create a constant with absolute path to the root by using define in ShowInfo.php:

define('ROOTPATH', __DIR__);

或者PHP< = 5.3

Or PHP <= 5.3

define('ROOTPATH', dirname(__FILE__));

现在使用它:

if (file_exists(ROOTPATH.'/Texts/MyInfo.txt')) {
  // ...
}

或使用$_SERVER中定义的DOCUMENT_ROOT:

if (file_exists($_SERVER['DOCUMENT_ROOT'].'/Texts/MyInfo.txt')) {
  // ...
}

这篇关于PHP根目录的绝对路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！